If you were told an atom was an ion, you would know the atom must have a neutral charge. charge. negative charge. positive charge.

When an atom is an ion, it must have a charge.

Explanation:

An ion is formed when a neutral atom looses or gains electrons.

When an atom looses electrons, it results in the formation of positive ion known as cation.  For Example: Sodium looses 1 electron to form ion.When an atom gains electrons, it results in the formation of negative ion known as anion. For Example: Chlorine gains 1 electron to form ion.

Hence, when an atom is an ion, it must have a charge.

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